Nonlinear spin-orbit coupling in optical thin films

Domenico de Ceglia (), Laure Coudrat (), Iännis Roland, Maria Antonietta Vincenti, Michael Scalora, Rana Tanos, Julien Claudon, Jean-Michel Gérard, Aloyse Degiron, Giuseppe Leo and Costantino De Angelis
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Domenico de Ceglia: University of Brescia
Laure Coudrat: Université Paris Cité, CNRS
Iännis Roland: Université Paris Cité, CNRS
Maria Antonietta Vincenti: University of Brescia
Michael Scalora: Charles M. Bowden Research Center
Rana Tanos: Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, “Nanophysique et Semiconducteurs” Group
Julien Claudon: Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, “Nanophysique et Semiconducteurs” Group
Jean-Michel Gérard: Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, “Nanophysique et Semiconducteurs” Group
Aloyse Degiron: Université Paris Cité, CNRS
Giuseppe Leo: Université Paris Cité, CNRS
Costantino De Angelis: University of Brescia

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Tunable generation of vortex beams holds relevance in various fields, including communications and sensing. In this paper, we demonstrate the feasibility of nonlinear spin-orbit interactions in thin films of materials with second-order nonlinear susceptibility. Remarkably, the nonlinear tensor can mix the longitudinal and transverse components of the pump field. We observe experimentally our theoretical predictions in the process of second-harmonic generation from a thin film of aluminum gallium arsenide, a material platform widely spread for its role in the advancement of active, nonlinear, and quantum photonic devices. In particular, we prove that a nonlinear thin film can be used to produce vector vortex beams of second-harmonic light when excited by circularly-polarized Gaussian beams.

Date: 2024
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DOI: 10.1038/s41467-024-45607-2

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